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KOH-activated tire pyrolysis char as an adsorbent for chloroorganic water pollutants

Kuśmierek Krzysztof, Doczekalska Beata, Bartkowiak Monika, Świątkowski Andrzej, Cherbański Robert, Kotkowski Tomasz

Chemical and Process Engineering : New Frontiers

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2024

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Vol. 45, nr 4

art. no. e79

EN

Activated carbons (ACs) produced from end-of-life tires with different tire pyrolysis char (TPC)-to-activator (KOH) ratios of 1:2, 1:3, and 1:4 were prepared and characterized. These materials were used as adsorbents for the removal of two common chloroorganic water contaminants such as 2,4-dichlorophenol (DCP) and 2,4-dichlorophenoxyacetic acid (2,4-D). The adsorption kinetics, equilibrium adsorption, and effects of solution pH were investigated. The adsorption of both adsorbates was found to be pH-dependent and preferred in acidic environments. The adsorption kinetics was evaluated using pseudo-first-order and pseudo-second-order kinetic models and mechanism - using Weber-Morris and Boyd models. Results demonstrated that the adsorption of DCP and 2,4-D on all ACs followed the pseudo-second-order model and was controlled by film diffusion. The Langmuir isotherm described the equilibrium data better than the Freundlich isotherm model. The maximum adsorption capacity of DCP adsorbed on AC1:2, AC1:3, and AC1:4 at equilibrium was 0.582, 0.609, and 0.739 mmol/g, respectively, while the maximum adsorption capacities for 2,4-D were 0.733, 0.937, and 1.035 mmol/g, respectively. The adsorption rate and efficiency were closely correlated with the porous structure of the tested adsorbents. The results showed that the activated carbons obtained from the scrap of end-of-life tires as raw materials could be used as a low-cost and alternative adsorbent for the removal of chlorinated organic pollutants from water.

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Modification of ash wood with furfuryl alcohol

Doczekalska Beata, Bartkowiak Monika, Zakrzewski Roman, Przybył Daria

Annals of Warsaw University of Life Sciences - SGGW. Forestry and Wood Technology

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2012

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No. 77

195--198

EN

The aim of this study was modification ash wood ( Fraxinus L.) with furfuryl alcohol and maleic anhydride as a catalyst. Investigated the effect of modifying on product color. The modification of wood was conducted out in two steps. In the first step was treatment with a mixture of modifying wood, and then curing at 105°C. the values of WPG for modifications carried out with aqueous solutions of furfuryl alcohol are lower than those carried out with furfuryl alcohol with the addition of maleic anhydride use in the furfurylation process pure solution of furfuryl alcohol did not cause large changes in color of wood ash in comparison to the control. The darkening of the wood surface was affected by the addition of maleic anhydride.

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An analysis of thermal decomposition in oxidative conditions of model wood-based materials glued with amino resin

Cichy Wojciech, Bartkowiak Monika

Annals of Warsaw University of Life Sciences - SGGW. Forestry and Wood Technology

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2012

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No. 77

125--129

EN

An analysis of thermal decomposition in oxidative conditions of model wood-based materials glued with amino resin. The presented work includes the results of thermal analysis of model samples of particleboards glued with urea-formaldehyde resin with varying degree of sealing (5 ÷ 30%), which is a measurable factor changing the elemental nitrogen content in the samples. Changes of the kinetic parameters of the thermo-destruction reactions occurring in the air were observed as well.